If you have any desire to make things or tinker, they’re fantastic. They’ll save you tons of time and possibly money also. I have a bunch of knickknacks and functional printed parts around my house now.

If that’s not your cup of tea though, you probably don’t have a good reason to buy one. It’s also a hobby and if you don’t plan to use it for more than printing the occasional spare part which you could otherwise just buy at a store, I don’t think it would justify the cost.